Bus state
Simply indicates whether the bus is powered, but not necessarily connected to any data
sources. However, if bus shows as ‘off’, but power is present along with an increasing error
count, it is possible that termination or cable topology is incorrect.
Rx Overflows
The unit received too many messages for its buffer before the application could read them.
Rx Overruns
The unit contained too many messages for its buffer before the driver could read them.
Rx/Tx Errors
These two numbers increase when there are error messages, and decrease when messages
are received successfully. These (unlike the other values) are not a cumulative count. Under
normal operation these should be at 0. Values around 96 upwards indicate a heavily error
prone network. If these numbers go too high for a given device, it will automatically drop off
the bus.
Rx/Tx Messages
Shows actual traffic in and out of device.
Bus Load
A high value here indicates network is near full capacity. Some devices automatically adjust
rate of transmission, if network traffic is heavy.
Fast Packet Errors
Cumulative counter of any fast packet error. This could be a missed frame, or a frame out of
sequence etc. NMEA 2000 PGNs are made of up to 32 frames. The entire message will be
discarded when a frame is missed.
Ú
Note: Rx and Tx Errors often indicate an issue with the physical network, which may be
resolved by correcting termination, reducing backbone or drop lengths, or reducing the
number of network nodes (devices).
Reset counters
Resets all counters in the NMEA 2000 tab of the Diagnostics dialog to zero. The counters start
recounting immediately.
SimNet Groups
The SimNet Group function is used to control parameter settings, either globally or in groups
of units. The function is used on larger vessels where several SimNet units are connected to
the network. By assigning several units to the same group, a parameter update on one unit
will have the same effect on the rest of the group members.
Software Setup | S2009-2016 Fish Finder User Manual
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